55198

Appears in sequences

• Distinct even elements in 3-Pascal triangle A028262 (by row).at n=36A028269
• Even elements to right of central elements in 3-Pascal triangle A028262.at n=26A028273
• Number of base 10 circular n-digit numbers with adjacent digits differing by 2 or less.at n=7A124852
• Eight white kings and one red king on a 3 X 3 chessboard. G.f.: 1/(1-3*x-5*x^2+4*x^3).at n=8A179610
• a(n) = cpg(n, 3) + cpg(n, 4) + ... + cpg(n, n) where cpg(n, m) is the m-th n-th-order centered polygonal number.at n=24A257051
• Convolution of nonzero octagonal numbers (A000567) with themselves.at n=10A276159
• Number of nX3 0..1 arrays with each 1 horizontally or vertically adjacent to 2 or 4 1s.at n=15A295200
• Numbers k such that 309*2^k+1 is prime.at n=38A323144
• Nonprime numbers k for which k*k' is a palindrome, where k' is the arithmetic derivative of k (A003415).at n=19A359331